You link the word97 specification for your 2000 document. I'm not sure if the file format changed, but luckily the encryption is the same.
I don't think you need the md5 hash (if there is one), you just want to break the encryption. It looks like there are word 97/2000 decryptors on the web (paid or freeware). My basic google search indicated that it's easier to break the proprietary hash + encryption (partially rc4) than to brute-force the password.
I wasn't going to link the page, but it wasn't hard to find.
Initially a unicode password is taken and some bytes appended, this password is passed through a varient of the standard md5 hash algorithm.
The non standard hash is tricky, and Im far from sure what benefit over standard md5 the modified md5 hash has.